334 ON THE PRODUCTION OF 
few moths which, at the end of -this time, remain still 
coupled, are gently separated, and the males thrown 
away. The females still remain on the frames for 
forty-eight hours. It is, therefore, necessary to have 
sufficient cloths ready to receive, every day, one or 
more new swarms, according to the importance of the 
issue of the moths from the pupae. 
The first year of education in the open air the silk- 
worm has much difficulty in holding on to the tree in 
very windy weather, and often lets itself drop to the 
bottom of the manchon, for \t often attacks the leaf at 
the leaf-stalk which holds t to the branch ; the male 
moth has also a difficulty in finding the female among 
the branches, and therefore many of them die. 
The case is very different after a few years ; the 
caterpillar becomes stronger and more lively, the moth 
, more alert, and the pattern on its wings more clearly 
marked. In a word, by returning to a state of nature, 
the Bombyx serigena becomes completely regenerated, 
and, its "grain, exempt from disease, promises an 
unfailing return for the following year. 
Education on the tree is the true criterion of the 
regeneration of the races of silkworms, but, although 
very simple, it cannot be carried on on a large scale, 
considering the minute attention required for it. 
Firmly convinced that in the actual crisis of affairs it 
was a matter of great importance to supply the edu- 
cator for silk with an abundance of really good grain, 
and having, by a series of education on the mulberry 
tree, completely regenerated the race which I rear, I 
devoted my attention, during several years, to carry 
out more fully what was on too restricted a scale in the 
manchons. 
